Contact.



A. J. LOGUIN.

CONTACT.

APPLICATION FILED Nov, 29.1911.

1 ,238, 3 1 1 Patented Aug. 28, 1917.

UNITED STATES PATENT 151i ALEXANDER J. LOGUIN, OF NORWOOD, OHIO,ASSIGNOR, BY MESNE ASSIGNMENTS, TO .ALLIS-CHALMERS MANUFACTURINGCOMPANY, A CORPORATION OF DELAWARE.

CONTACT.

Specification of Letters Patent. Patented Aug; 238, 191'? Applicationfiled November 29, 1911. Serial No. 663,103.

7'0 aZZ whom it may concern:

Be it known that I, ALEXANDER J. LoGUIN, a subject of the Czar ofRussia, residing at Norwood, in the county of Hamilton and State ofOhio, have invented certain new and useful Improvements in Contacts, ofwhich the following is a full, clear, and exact specification.

This invention relates to contacts.

In the use of controllers and various types of switches, it is desirableat times to inspect the contacts. It is sometimes necessary to trim upthese contacts and sometimes to replace the contact tips or memberforming a part or the Whole of contact fingers. It is highly desirablethat the contacts be so located and arranged that they may be readilyinspected, and removed without the use of tools:

It is therefore the object of my invention to provide a simple,inexpensive, and durable contact construction, wherein-the contactfinger or parts thereof can be removed readily from the main bodyportion or support of the contact construction without the use of toolsand wherein the parts may be readily adjusted.

The various novel features of my invention will be described in thespecification and particularly set forth in the appended claims.

The invention is illustrated on the accompanying sheet of drawings, inwhich Figure 1 is a side elevation of my contact construction; and,

Fig. 2 is a front elevation thereof.

Secured to an insulating base 10, by suitable means, is a terminal plate11. Secured to this terminal plate by a screw 12 is a conductingsupporting member 13 provided with a hook-shaped portion 14: and a-boredportion 15 having a shoulder 16 against which the head 17 of a plunger18 is normally retained. The plunger 18 extends out through one end ofthe bored portion 15 and is yieldably pressed outwardly of said boredportion by a spring or resilient member 19 which engages. the-head 17 ofthe plunger 18 and is retained in an energystored position within saidbored portion 15 by a pin 20. A contact finger 21, which preferablyrigid, having a contact tip 22, is provided with laterally extendinglugs or projections 23 which are adapted to engage and'be retained inthe hook-shaped portions 14 of the member 13. One end 24: of thesubstantially L-shaped contact finger 21 is adapted to engage a bolt 25which acts as a stop for said contact finger. This stop 25 is adjustablysecured in the member 13 for the purpose of adjusting the contact tip 22with respect to its cooperating contact surface 26. When the desiredadjustment is obtained the bolt 25 is locked in said adjusted positionby a nut .27 engaging said bolt 25. Interposed between one end of thecontact member 21 and the contact .tip 22 is a flexible conductor 28 theother end of which is secured to the member 13 by a-screw 29.

The contact finger 21, which is pivotally mounted in the hook-shapedportion of the support 13, can be readily removed therefrom by forcingsaid contact finger against the action of the spring 19 until the lugsor projections 23 of said contact finger are beyond the ends of theh00k-shaped portion 14 when the contact finger can he slipped away fromits support. Itis therefore seen that if it is found necessary to trimthe contact tip 22 or to replace the tip or finger, or any partsthereof, the contact finger can be readily removed from its supportwithout the use-of tools. The spring 19, which may be replaced by aspring of any desired strength, is adapted to take up the irregularitiesof the contact surfaces of the contacting portions, holding the contactfinger in contact with its cooperating contact member, and at the sametime serving to retain said contact finger in its support.

There may be various modifications in the precise form and arrangementhere shown and described, and I aim to cover all such modificationswhich do not involve a departure from the spirit and scope of myinvention as set forth in the following adjustable in said support in adirection 10 transverse to the line of movement of said plunger, saidplunger urging the contact portion of said finger into engagement with acooperating contact and another portion of, said finger into engagementwith said stop.

2. In combination, a support having a hook-shaped portion and a recess,a springpressed plunger disposed in said recess, a contact finger havina projection disposed n said hook-shape portion, and an adjustable stopcarried by said support, said 10 plunger urging the contact portion ofsaid finger into engagement with a cooperating contact and anotherPortion of said finger into engagement with said stop.

In testimony whereof I aifix my signature, in the presence of twowitnesses.

ALEXANDER J. LOGUIN.

